已知三点A、B、C的坐标分别为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440016_ST/0.png)
,B(3,0),C(0,3),若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440016_ST/1.png)
,求
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的值.
考点分析:
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记函数
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的定义域为A,g(x)=lg[(x-a-1)(2a-x)],(a<1)的定义域为B.若B⊆A,求实数a的取值范围.
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已知整数对的序列如下:(1,1),(1,2),(2,1),(1,3),(2,2),(3,1),(1,4),(2,3),(3,2),(4,1),(1,5),(2,4)…,则第60个数对是
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给出下列四个命题;其中所有正确命题的序号是
①函数f(x)=x|x|+bx+c为奇函数的充要条件是c=0;
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/1.png)
的夹角为45°,且|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/2.png)
|=4,(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/3.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/4.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/5.png)
)•(2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/6.png)
-3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/7.png)
)=12,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/8.png)
|=
;
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/9.png)
在
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225251804044089/SYS201311012252518040440011_ST/10.png)
上的投影等于
.
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